Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Output | 2.5 V |
| Initial Accuracy | ±0.2% maximum stated |
| Temperature Drift | 20 ppm/°C maximum from −40°C to +125°C |
| Quiescent Current | 115 µA maximum; about 100 µA typical family value |
| Dropout | 5 mV unloaded stated |
| Output Current | ±10 mA source/sink capability |
| Stability | No load capacitor required by family description |
| Exact Package / Packing | SOT-23 (DBZ), 3 pins; 3000-piece large reel; marking R31C |
Product Overview
REF3125AIDBZR is a 2.5 V low-dropout precision reference designed for battery-powered and portable data-acquisition systems. It combines moderate precision with very low headroom requirement and a three-pin SOT-23 footprint.
The 5 mV unloaded dropout allows the reference to remain useful when the supply is only slightly above 2.5 V, reducing wasted headroom in low-voltage designs. It can source or sink current, simplifying ADC/DAC reference and bias networks.
The AIDBZR exact code is the 3000-piece large-reel 2.5 V version with marking R31C and −40°C to +125°C operation.
For related devices, see HKEQGOO’s Voltage References category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | REF3125AIDBZR |
| Output | 2.5 V |
| Initial Accuracy | ±0.2% maximum stated |
| Temperature Drift | 20 ppm/°C maximum from −40°C to +125°C |
| Quiescent Current | 115 µA maximum; about 100 µA typical family value |
| Dropout | 5 mV unloaded stated |
| Output Current | ±10 mA source/sink capability |
| Stability | No load capacitor required by family description |
| Exact Package / Packing | SOT-23 (DBZ), 3 pins; 3000-piece large reel; marking R31C |
| Manufacturer Status | Active / Production |
| Part Marking | R31C |
Functional Highlights
Very low dropout is useful on 2.7–3.3 V rails
The reference can maintain a 2.5 V output without the large supply margin required by older bandgap references.
No mandatory load capacitor simplifies tiny reference nodes
Board area and startup behavior can improve, though local bypassing should still follow the datasheet for the connected load and noise target.
Design Considerations
- Check dropout at the actual source/sink load, not only the unloaded 5 mV headline.
- Budget 20 ppm/°C drift across the full operating temperature span.
- Keep high-frequency converter currents off the reference return path.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists REF3125AIDBZR as Active / Production; SOT-23 (DBZ), 3 pins; 3000-piece large tape and reel; −40°C to +125°C; marking R31C.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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